Gravitational recoil from binary black hole mergers in scalar field clouds

Abstract

In vacuum, the gravitational recoil of the final black hole from the merger of two black holes depends exclusively on the mass ratio and spins of the coalescing black holes, and on the eccentricity of the binary. If matter is present, accretion by the merging black holes may modify significantly their masses and spins, altering both the dynamics of the binary and the gravitational recoil of the remnant black hole. This paper considers such scenario. We investigate the effects on the kick of the final black hole from immersing the binary in a scalar field cloud. We consider two types of configurations: one with non-spinning and unequal-mass black holes, and a second with equal mass and spinning holes. For both types, we investigate how the gravitational recoil of the final black hole changes as we vary the energy density of the scalar field. We find that the accretion of scalar field by the merging black holes could have a profound effect. For the non-spinning, unequal-mass binary black holes, the kicks are in general larger than in the vacuum case, with speeds of approximately 1,200 km/s for binaries with mass ratio 2:1, one order of magnitude larger than in vacuum. For equal mass, binaries with black holes with spins aligned with the orbital angular momentum, kicks larger than in vacuum are also found. For systems with spins in the super-kick configuration, the scalar field triggers a similar dependence of the kicks with the entrance angle at merger as in the vacuum case but in this case depending on the strength of the scalar field.

13 pages, 9 figures

References in corpus (13)

• The Standard Model Higgs boson as the inflaton
• Large Merger Recoils and Spin Flips From Generic Black-Hole Binaries
• Total recoil: the maximum kick from nonspinning black-hole binary inspiral
• Power-counting and the Validity of the Classical Approximation During Inflation
• Supermassive recoil velocities for binary black-hole mergers with antialigned spins
• Unitarizing Higgs Inflation
• Superkicks in Hyperbolic Encounters of Binary Black Holes
• Multipole expansions for energy and momenta carried by gravitational waves
• Circumbinary Disk Accretion into Spinning Black Hole Binaries
• Binary Black Hole merger in f(R) theory
• Ultra-Close Encounters of Stars With Massive Black Holes: Tidal Disruption Events With Prompt Hyperaccretion
• Probing the Binary Black Hole Merger Regime with Scalar Perturbations
• Black Hole - Neutron Star Binary Mergers: The Imprint of Tidal Deformations and Debris

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• Impact of ringdown higher-order modes on black-hole mergers in dense environments: the scalar field case, detectability and parameter biases
• Extreme mass ratio inspirals in dark matter halos: dynamics and distinguishability of halo models